Let Meeting.all return all meetings if tenant_id argument is not passed

[Ithanil]

Let Meeting.all return all meetings, regardless of tenant association, if tenant_id argument is not passed.

Description

Previously, with Multitenancy enabled, Meeting.all would return only meetings without tenant association if the optional argument tenant_id was not passed. This leads to numerous bugs in the code, because the tenant_id argument is not passed in many cases. An example would be https://github.com/blindsidenetworks/scalelite/issues/1010 .

I propose to let Meeting.all return all meetings, regardless of tenant association, when it is called without tenant_id. In any case where only a certain tenant is considered, the tenant_id would have to be passed anyway. This fixes the issues with meetings remaining associated after panicking/disabling servers with Multitenancy enabled.

Testing Steps

Test all the uses of Meeting.all:

https://github.com/search?q=repo%3Ablindsidenetworks%2Fscalelite%20Meeting.all&type=code

Fixed Issues

At least: https://github.com/blindsidenetworks/scalelite/issues/993 https://github.com/blindsidenetworks/scalelite/issues/1010

[farhatahmad]

Thanks for the PR - I was looking in the wrong area

[farhatahmad]

1011 Can be closed correct?

[Ithanil]

1011 Can be closed correct?

Yes, if this PR here is merged, the other one can be closed.

[farhatahmad]

I'll fix the tests in a follow up PR - thanks for this